'book_children': book.children.all().order_by('parent_number', 'sort_key'),
             'active_menu_item': 'books',
             'club_form': ScheduleForm() if book.preview else None,
             'club': Club.objects.first() if book.preview else None,
             'book_children': book.children.all().order_by('parent_number', 'sort_key'),
             'active_menu_item': 'books',
             'club_form': ScheduleForm() if book.preview else None,
             'club': Club.objects.first() if book.preview else None,